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Stochastic process is main factor to affect plateau river fish community assembly.

Xiaoxuan Li1, Qigong Xu1, Rui Xia1

  • 1State Environmental Protection Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Science, Beijing, China.

Environmental Research
|May 12, 2024
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Summary

Stochastic processes, not elevation, drive fish diversity in plateau rivers like the Huangshui River. Habitat fragmentation and limited connectivity significantly influence fish community assembly, highlighting the importance of ecological processes in eDNA monitoring.

Keywords:
12S-rDNACommunity assemblyFish diversityPlateau rivereDNA

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Area of Science:

  • Ecology
  • Environmental Science
  • Molecular Biology

Background:

  • Plateau river ecosystems are sensitive to environmental changes, making fish diversity and community assembly complex to study.
  • Understanding these dynamics is crucial for interdisciplinary research in ecology and environmental science.

Purpose of the Study:

  • To identify mechanisms influencing freshwater fish diversity and community assembly in plateau rivers.
  • To investigate the role of stochastic processes in fish diversity variations and community assembly.
  • To assess the impact of environmental factors, including altitude, on fish biodiversity patterns.

Main Methods:

  • Environmental DNA (eDNA) metabarcoding to identify fish species.
  • Null model analysis to evaluate the influence of stochastic processes.
  • Statistical analysis to correlate fish diversity with environmental factors like altitude.

Main Results:

  • Identified 30 operational taxonomic units (OTUs) corresponding to 20 fish species in the Huangshui River.
  • Found significantly higher fish alpha-diversity in the upstream region compared to the middle-lower reach.
  • Determined that stochastic ecological processes, driven by habitat fragmentation and limited river connectivity, primarily shape fish community assembly, rather than physicochemical factors or altitude.

Conclusions:

  • Stochastic processes, particularly habitat fragmentation and downstream connectivity limitations, are the main drivers of fish community assembly in plateau rivers.
  • Elevation is not the primary factor influencing fish biodiversity patterns in these environments.
  • The eDNA approach, integrated with ecological process considerations, shows promise for monitoring fish biodiversity in plateau rivers.